Question: What was the nominal GDP of the United States of America on January 1, 2014?
Paraphrase: On January 1, 2014 the nominal GDP of the United States was what?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q30 p:P2131 ?s . ?s ps:P2131 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'2014')) }